Product Detail Affordable solution for adding four high performance eSATA ports to your computer SATA II compliant, 3GB/s and 1.5GB/s auto-negotiation FIS-based port multiplier-aware to support up to 20 disk drives Native PCI Express (PCIe) x4 host bus interface for high-performance applications Spread Spectrum Clocking (SSC) support for compatibility with all SATA drives . The "Tempo 4CH Sata II Pcie Controller Ext E4P Multiplier" is best product for you. We recommended Tempo 4CH Sata II Pcie Controller Ext E4P Multiplier